Answer: Wetlands
Notes: Wetlands are a natural source of methane emissions. Methane is produced in wetlands through the process of anaerobic decomposition, which occurs when organic matter decomposes in the absence of oxygen. Wetlands, such as marshes and swamps, are areas where water covers the soil or is present at or near the surface for at least part of the year. The wet conditions in wetlands promote anaerobic decomposition and the production of methane. Methane is released from wetlands through a process called ebullition, which is the release of methane bubbles from the sediment to the water surface. Methane can also be released from wetlands through diffusion, which is the movement of methane from the sediment to the atmosphere through the water column. Wetlands are a significant source of methane emissions, contributing approximately 20% of global methane emissions.
